Starter grinding

Hello. Sometimes when I start my vehicle, the starter will make a grinding noise. It started it off by doing it sometimes but now it does it more. I thought it was a bad starter because the starter was grinding but we recently replaced the starter with a new starter and it is still doing it. Now we think it maybe the ignition switch. The car stops grinding when the key is turned back to the left slightly. We didn't realize it did that until now because I noticed that the car seems to crank up by itself without putting much effort into cranking it up. Side note: I do not have the original ignition switch in my vehicle because my car was stolen about a year and a half ago and a locksmith replaced the ignition switch. Also, my check engine light came on and it gave me 2 codes but I can't seem to find the slips but the word solenoid keeps jumping out to me. I am trying to figure out the issue before I spend anymore unnecessary money. Key ignition switch needs to be replaced, or is it anything else I can do to the ignition switch instead of replacing it again, or is it something else?