Just tried this several times but I can't replicate your problem - my message comes up as typed. I'm on PR1.3, Northern Europe
I can replicate this issue. I probably have never noticed this I think, because there is no need to use the space bar, on the swype keyboard, in this manner. For instance if you attempt to enter another word directly after entering 1024k a space will be added correctly, also if you swipe from either the comma or period to the space bar the cursor behaves as it should. Interesting find though.