Lines Won't Delete

[Tobobo]

I'm creating a seating component to use (and share) but there is some issue with deleting lines. When I delete one of the lines that aren't required, it becomes a profile thickness line and won’t delete unless I delete the face it is on and then it will delete.

There are three components in it as it is a wooden seat with cham corners but it happens on most if not most of the lines!

It’s getting frustrating and I would like to know if it happens on your machines as well.

PS I have solved the problem (Thanks to Jackson) but it could be a bug that needs sorting.

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Type 5.skp