Trados Studio 15 doesn't add a space between segments in generated target file

I've been having this problem for a while.
In target files generated from Studio projects I create myself, Studio doesn't add a space between segments. In other words, my target file comes out without the obligatory space between sentences. I'm having to manually fix my documents after generating my target files, to insert a space after each period (full stop), colon, semicolon, question mark and exclamation mark.
I don't have this problem with packages I receive from my translation agency client.
I'm assuming one of my settings is not configured right, but I haven't been able to find where that setting is located. Can someone help me with this?
Thank you.