Interesting stat to point out, but right now, I'm not putting any weight on it. Lonnie played a LOT of games earlier in the season with an injury in his shooting hand (he was out a couple of games IIRC, and when he did come back, played multiple games with a wrapped up hand, which also can't be good for shooting, and coincided with a particularly bad shooting period). If that stat carries on into next season, it'd definitely be worrisome, something like DeMar's on/off numbers in regards to the rest of the team. But right now, and especially given the teams' fluctuations throughout the year and Lonnie's change in role multiple times, there's just too much noise to draw conclusions.
I seem to read that the stats support that he's been shooting better lately. Hopefully he can keep it up - having a solid 3pt shot will guarantee him a spot in the rotation and maybe SL, while he works on the rest of his game.