It is a bit difficult to judge from a picture what the cause of the strange behavior is. Can you post your complete project, so that we all can have a look at all of your settings? To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file (do NOT use chrome, that still may not work).
First the Saleae logic analyzer way too slow to get accurate timing.
Although display you show is relatively (within 135 nS) correct.
Consider a scope and look at the trigger vs a specific channel. In fact
you can trigger DSO on a pin changing before strobe as a condition.
Or on a condition of excessive delay of a pins response.
What is used as the trigger, the STB ?