matching 4 tiles and rowclearing

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Hi

I've noticed that sometimes, you can set up a pack of matching tiles that includes several 4-in-a-row combinations that when triggered doens't clear the rows as I believe they should.
Example - this can fairly often be done with Magneto (Marvel Now) and his Purple power on 5.

I've set up rows like this (x = whatever tile, B = blue tile)

xxBBBBxx
xBBBBxxx

What happened was, that the blue tiles popped like they should, but the rows where still intact (leaving countdown/strike/attack tiles in place potentially).

Other times I've matchet the colours like so:

xxBxxxxx
xxBxxxxx
xxBxxxxx
xBBBBXxx

Which results in (of course) the blue tiles popping as well as clearing out the two rows that included the two 4-of-a-kind matches.

I'm pretty sure there are other matches that leaves rows intact, but I've just begun to notice this and so this is the only one I remember. I can try to spot others if that would help.

Regards
Von Es