The parser that is out there for FFXIV does not account for overhealing since there is no way for it to know how much health you have. (Unless they added overhealing to the combat log since I last looked.) Also if you go out of range then it doesn't show in the logs as accurately. Not to mention, if someone is spamming medica then they will out heal the single target just because medica heals a group of people while you are single healing. This was clearly a case of someone wanting to blame someone else.

@OP: Report the tank that started the vote kick, getting kicked for that reason is bannable. The VK system according to the FAQ is for Harassment, disconnects and something else that I can't remember at this moment. Does not include being vote kicked for not parsing well enough.