Project is not very advanced and any good programmer should be able to do it.
You have to do some testing to find the actual bug and make a PR to fix it.
I will pay half in advance if you tell me what exactly causes the issue, and rest after you make a PR and fix it.
PM me for details.
Hello
i can fix your bug add me on my telegram id; @opsondell
or skype id; opsondell