Problem was in the Heal + Recharge methods.

;-)

function solve(input) {
    let num = +input.shift();
    let index = 0;
    let arrObjects = [];
    let current = input.shift();

    while (index < num) {
        let obj = {};
        let [hero, hitPoints, manaPoints] = current.split(' ');
        hitPoints = +hitPoints;
        manaPoints = +manaPoints;

        obj = {
            hero,
            hitPoints,
            manaPoints
        };

        arrObjects.push(obj)
        current = input.shift();
        index++;
    }

    while (current !== 'End') {
        if (current.includes('CastSpell')) {
            let [commandName, heroName, manaPoinstNeeded, spellName] = current.split(' - ');
            arrObjects.filter(el => {
                if (el.hero == heroName) {
                    let result = el.manaPoints - manaPoinstNeeded;

                    // if (el.manaPoints >= manaPoinstNeeded && el.manaPoints <= 200) {
                    if (el.manaPoints >= manaPoinstNeeded) {
                        el.manaPoints -= manaPoinstNeeded;
                        console.log(`${el.hero} has successfully cast ${spellName} and now has ${result} MP!`)
                    } else {
                        console.log(`${el.hero} does not have enough MP to cast ${spellName}!`)
                    }
                }
            });
        } else if (current.includes('TakeDamage')) {
            let [commandName, heroName, damage, attacker] = current.split(' - ');
            arrObjects.filter(el => {
                if (el.hero == heroName) {
                    damage = +damage;

                    if (el.hitPoints > damage) {
                        el.hitPoints -= damage;
                        console.log(`${el.hero} was hit for ${damage} HP by ${attacker} and now has ${el.hitPoints} HP left!`)
                    } else {
                        console.log(`${el.hero} has been killed by ${attacker}!`)
                        let index = arrObjects.indexOf(el);
                        arrObjects.splice(index, 1);
                    }
                }
            });
        } else if (current.includes('Heal')) {
            let [commandName, heroName, amount] = current.split(' - ');
            amount = +amount;
            arrObjects.filter(el => {
                if (el.hero == heroName) {
                    let result = el.hitPoints + amount;
                    if (result <= 100) {
                        el.hitPoints += amount;
                        console.log(`${el.hero} healed for ${amount} HP!`)
                    } else if (result > 100) {
                        // let residue = result - 100;
                        // amount = Math.abs(amount - residue);
                        let residue = 100 - el.hitPoints;
                        el.hitPoints = 100;
                        console.log(`${el.hero} healed for ${residue} HP!`)
                        // console.log(`${el.hero} healed for ${amount} HP!`)
                    }
                }
            })
        } else if (current.includes('Recharge')) {
            let [commandName, heroName, amount] = current.split(' - ');
            amount = +amount;
            arrObjects.filter(el => {
                if (el.hero == heroName) {
                    let result = el.manaPoints + amount;

                    if (result > 200) {
                        // let residue = result - amount;
                        // amount = Math.abs(amount - residue);
                        let residue = 200 - el.manaPoints;
                        el.manaPoints = 200;
                        console.log(`${el.hero} recharged for ${residue} MP!`)
                    } else {
                        el.manaPoints += amount;
                        console.log(`${el.hero} recharged for ${amount} MP!`)
                    }
                }
            })
        }

        current = input.shift();
    }

    for (let line of arrObjects) {
        console.log(`${line.hero}
  HP: ${line.hitPoints}
  MP: ${line.manaPoints}`)
    }
    //console.log(arrObjects)

}