Duplicate letters when editing in a text box.

Hello, Whenever I edit a text that I've already typed or pasted into a text box, I get random word pairs that are fused into one wrong word by a duplicate of either the last letter of the first of the two or theffirst letter of the second. For example, I just typed "SwiftKey bugs" into a search box, but when I try to edit that to "SwiftKey repeated letters bug," I get either "SwiftKey repeateddletters bug" or "SwiftKeyrrepeatedlletters bug." Instead of a space between "repeated" and "letters," I keep getting a duplicate of the last letter in the first word or of the first letter in the second word. This is a constant issue that occurs many times daily and one that I can easily replicate. Thanks.