Unable to select Grass foliage with foliage selection tool

Hi guys,

So i’ve only been using UE4 for a few days now, but I have a fairly good understanding of the basics. I’ve been designing my level with the foliage brush, and slowly fixing mistakes with the brush by selecting them and re positioning them. Recently I ran into an issue where I can no longer select the grass mesh, I can select all the other meshes in the brush but not the grass. Sometimes I can fix it by restarting, but not always, If any of you could let me know how I could fix this issue, It would be greatly appreciated.