$50 NL - vs $25 NL

I have been playing at Party for about 6 weeks now.

I have played to date 2500 ish hands at $50 NL

and have played 1400 ish hands at $25 NL

Yes I realise this is a small sample size - however.

I am getting killed at $25 NL and am down $175 - (-25 BB/Hr)

but at $50 NL I am up $130 (5 BB/Hr)

I play the same way at either table.

I started out at $50NL and managed to lose my original buy in - bought in again - moved down a limit and lost a whole lot more. Finally I decided I'd take the last $50 of my bankroll and give the $50NL table one last shot...

Since moving back up I have recouped my 2nd buy in and am doing much better.

Aside from variance - is there anything I am likely to be doing wrong on the lower limit tables that can account for my awful results there?

Mark...