Convex invalid transform warning, no origin

When my map is loaded, these warnings pop :

LogPhysics: Warning: PopulatePhysXGeometryAndTransform(Convex): ConvexElem has invalid transform
LogPhysics: Warning: ForeachShape(Convex): ScaledElem[0] invalid
LogPhysics: Warning: PopulatePhysXGeometryAndTransform(Convex): ConvexElem has invalid transform
LogPhysics: Warning: ForeachShape(Convex): ScaledElem[0] invalid
LogPhysics: Warning: PopulatePhysXGeometryAndTransform(Convex): ConvexElem has invalid transform
LogPhysics: Warning: ForeachShape(Convex): ScaledElem[0] invalid
LogPhysics: Warning: PopulatePhysXGeometryAndTransform(Convex): ConvexElem has invalid transform
LogPhysics: Warning: ForeachShape(Convex): ScaledElem[0] invalid

Nothing about the origin of the problem. Is it a problem with some static mesh collision ? How can I find which one is wrong ?

I found the culprit by checking the blueprints… for hours…
A variable (value 1000000) divided by 0.1. Removing it or replacing with a * 10 fixes this.