Paul from SWISCO responded:
January 19, 2017
It sounds like your sashes aren't meshing together correctly. Check the bottom sill and top channel for any obstruction. Also check the top and bottom sash interlocks to see if the weather stripping or something is not letting the sashes mesh and giving the lock tongue room to slide in. Another problem might be the top sash rail or bottom sash rail are bowed.
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