Well, frankly I'm to used too World Edit/World Guard to give it up, and I don't think the problem lies within the plugin, as I've never had any issues with it before. I'm pretty sure the issue is with Tekkit, since all block placement seems to be messed up, anytime a block is placed, anywhere (including protected regions), including HawkEye logs (With /HE tool enabled!) they stay, regardless of player permissions. This is a TAD annoying. However, players still can't break blocks in protected regions, so if they do place a block, it is easy to catch them. Still, I would like to see this issue fixed.
*than
*Grammar Nazi at work*