I just got a new amp for my 15s and it works great, maybe too good

The max RMS on the subs are 500 4ohms and the amp is 900 so each sub is getting 450 at 2 ohms and 370 at 4 ohms

I was just sitting around listing to my music and I wanted to get out and check my subs, so I truned down the music first just to make sure every thing was good be for I truned it back up, one of my subs was hitting really different to my other sub, if any one you know the song 2step by Unk, that is the song I had on, and when it got to the lower bass the sub would just hit then back off then hit again then back off again, and the other sub would hit and keep vibrating and then hit and keep vibrating.

What is wrong with my sub?

One could be blown. The one good driver could be pushing the other like a passive radiator.
Put an ohm meter across each sub. One should read 4 ohm, and the other should be infinity (open coil).

I was told it was clipping because I'm pushing too much power, how is that, I have the right amp for the subs?

I'm not sure if you fixed your problem or not, but one sub may also be running reverse of the other. If you have the positive and negative hooked up properly on one sub, and you have them reversed on the other side, your subs will kind of cancel each other out in a way. One will hit fairly hard and the other will sort of just look like it is being pushed around by the other one.

Just a thought.

Lol, thanks for the advice but I have already switched to two 12in Type Rs and I like them a lot better than the 15s I had