If the Tripp mags are shorter than the DW's, I'm guessing you bought officer size by mistake. The 7 round Tripp full size mags are the same size as everybody else's 8 rounders, some folks think putting 8 in a mag originally designed for 7 is asking for trouble, don't have an opinion, own both.
The steel bottomed office mags are model 7R-45-WO. The 7 round steel bottom full size are 7R-45-WG. The only difference is the last letter. Do they have an all metal follower? If so, then they are officer size.
I think the DW mags are made by checkmate, never had any issue with those either, just prefer Tripp. I used to have Wilson's as my goto , but the Tripp's seemed better made. The new ETM mags are very good, and I don't own any but my birthday is coming up if anybody cares.