suggestive text issue

[DallasXanadu]

Just got a surface book today. Noticed that when typing on FB in tablet mode, when I type a few letters, then tap the suggested word I'm looking for, it adds the word onto the letters I've already typed, instead of replacing them with that word. Oddly, when typing here in the forum, it does it correctly, like it always has on my phone. I thought maybe it was a setting, but if it works here, I guess not.