Is it normal an increase in pressure when diverter valve switch from waste to MS? if not, how to

I have problems with tailing in my analysis. The peak is very broad and has a symmetry of ca. 2.2 when during development it was 1.3. It could be a problem with the column but I saw from the pressure profile that when I have the valve switching from Waste to MS, the pressure increase (see picture). Could be the reason of my problem? How can I solve it?

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