FlorisBoard used to be my keyboard, but a couple months ago I found the Unexpected Keyboard. Both keyboards don't have spell suggestion.
FlorisBoard didn't have update for almost a year, but the developer is still working on it. The Unexpected Keyboard had an update last month.
Between those keyboards I prefer the Unexpected Keyboard.
Oh, I forgot about. I suffered from the same problem. It also happened when I tried swiping long words. I would get a completely different word or nothing at all.