I have an annoying bug going on with my KSP 1.11 installation. All mods have been uninstalled!
In the R&D building, under Advanced Exploration the SEQ-9 is shown 8 times. All but the last instance is showing as owned. The VAB won't let me place the SEQ-9 on any ships, stating that it first has to be purchased in R&D. If I purchase that last instance of the SEQ-9, it will deduct 2,200 from my credits but I'm still unable to use the part.
Any suggestions on how to fix this or further troubleshoot?