5e Character Sheets changing mid game

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Hi AJ C.,  The Javelin issue is a known bug of the D&D 5e by Roll20 sheet caused by a corrupted Javelin equipment entry.  To remedy this issue permanently go to the Javelin equipment entry. Hover over the weight area and click the little bubble that appears. Turn off the "attack" checkmark.  Then add an attack to your attack section and set it up for the Javelin.  For the Eldritch Blast a similar issue is happening, although it is not a bug. The Eldritch Blast attack is being defined by the spell. I am guessing you are editing the attack, not the spell.  To fix that edit the spell to add the charisma mod, not the attack. In the spell checkmark the "Add Ability Mod to Damage or Healing" box.