DW-WAX column - analyse methanol in water:isopropanol (95:5). UNEXPECTED peak!!!

Hello, Im using DW-WAX column (30m, 0,53mm, 1um). I was trying to analyse methanol in water:isopropanol (95:5). I have huge problem, in my desorbent always is methanol peak and it is big.. the weidrest is that this peak in 1st inj has area about 10, next inj - peak is bigger, sometimes area 200.. then 3rd inj peak has area about 25 and over and over again.
What could be the problem? Any idea how can I remove it? The program is isotermal - 50*C for 5 min, detector temp=250*C and injector temp=200*C.

Please heeeelp!

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