My Iphone is being weird?

I have a Iphone 6S Rose Gold. I cracked it a few months ago and damged the LCD I think it was. I got the screen fixed along with LCD and everything was working fine for about 1 month. Now, its been acting up. Sometimes, at random it will start clicking on random things, swiping stuff, typing, opening apps like a ghost was controlling it. I read some where it was like a bad aftermarket screen or something. This is problem 2. Today I got some water in the charging port and now it is not charging. I checked my local repair shops website and they said they could replace this. Please tell me what I should do.

How does device supervision work on company iPhone without a profile?

My old work iPhone has device supervision on it from when I worked for them. I deleted the profile but it still says it is being supervised. I know they can put the phone in lost mode but other than that, what can they do or see without a profile installed on the phone? Can they view any activity?

IPhone 6S home button sticky?

So my iPhone's home button is sticky and I keep using isopropyl alcohol on it and it becomes not sticky for a few minutes then it gets sticky again. How do I fix it?

Two songs are stuck on my iPhone as alarm choices. How do I remove/replace them from that list?

So I would appear to have a limit of 5 songs to choose from on this list. I see no way to directly delete songs. The list is full and when I add a song the song at the top of the list is bumped off. But that doesn't work for getting the song choice the iPhone already had on there* or the first song I selected for the list off of the list. Why? Can they be removed and if so how?

*Apparently my alphabetically first song bought from iTunes