u/Hydrospec1

Hi there. I am struggling with something and am looking for answers. I have been trading options for a little bit, still very new, but im having a problem. Whenever I sell my option, I almost always lose more money than my chart displays. For example, I will be +$200, sell, and make $200, but when im down -$200, sell, i'll lose like $300. Is there some hidden greek or something im not factoring in? It's very confusing. I'm doing market buy and market sells as my broker stalls sometimes on limit sells. Thanks for any help. I appreciate it.