What I observed is that they stop the ICO then switch to IEO. Care to name which project does both ICO and IEO at the same time? With regards to the not disclosing the total funds raised, almost every project is doing that. It must be because of legal issues.
This is also what I know. OP must have been confused that he thought that the ICO of a certain project is still running even when they announced an upcoming IEO. I also saw many projects that have done like this and most of them came from ICOs of 2018 in 3rd/4th quarter where their ICOs took forever just to raise a softcap/hardcap. So it is very impossible to happen because first of all, ICOs could lead to gas wars and then IEOs are lottery so rich investors will have advantage over this.