Shut down Bitcoin Core. Next right click the shortcut for Bitcoin Core and choose "Properties". Then in the box labeled "target", move the cursor all the way to the right and add the following
-zapwallettxes
Make sure that there is a space between what is already in the target box and -zapwallettxes. Now click Ok and double click the shortcut to start Bitcoin Core. When it is fully started, you should see that any unconfirmed transactions that you previously had are no longer listed in the transactions tab. You can now resend those three transactions with the right fees.
A million thanks, that worked. I really appreciate it!!!
you helped me and explained the real issue. I couldn't get my head around why this transaction with a good transaction fee was not going through, answer because there was another one blocking it with no transaction fee.