Yes, that is the designed behavior. Why, I don't know.Yes you can redate the four transactions. But you will also need to then do a Remove shares/Add shares pairing to get the acquisition dates of the spinoff back to the original acquisition dates - for cap gains timing purposes.This 'flaw' is why I use Remove Shares / Add Shares from the beginning instead of the Corp Spinoff. One remove for all original shares, two adds to add in the two original lots at reduced basis, two add to add in the new shares at their basis.
If your security is in a taxable account (non-retirement), your acquisition date for income tax purposes IS the same as your original purchase date.
This would be a really good fix to make, having a transaction date of the issue date but a tax acquisition date that equals the original security purchase.
My own spinoff did not download properly from Merrill Lynch Investments
it's in an IRA so I can fudge it by using a return of capital and "buy" of the spinoff security.