There is a known issue where when typing in certain apps predictions are being stuck together like "thisthis" - we call this the doubledouble bug.
We've been getting a lot of help from the community with videos and screen shots which have been extremely helpful in narrowing down the issue and showing specific examples.
We understand this is making SwiftKey hard to use and even unusable for some. We want nothing more than to get this issue fixed as soon as possible.
We appreciate your time and patience with us while we find the best solution.
As of July 5th, 2016 we've put a potential fix in our beta app. Please give a test here.
You can let us the community know if the fix is working by posting on this thread here.