iPhone 5s DIY solar charger recognized but not charging?

I finished building a USB solar charger DIY kit I bought from KipKay earlier today, and my phone kind of bugs out whenever I use it. When it was first completed, it was charging perfectly fine, with no errors whatsoever. After a while, "This device may not be supported" errors started showing up, and my phone started charging backwards. I replaced the cable, and the errors eventually went away. However, my phone is still "charging backwards", and sometimes charging stops during connection.

I've tried cydia tweaks, but all they do is remove the error, and the phone refuses to charge.

It probably has something to do with the charger and not the phone, but is there anything I can do?