What " finished" size are you trying for?
Two four inch squares should - theoretically - make up into two 3-5/8 inch squares. Many of us have found life easier when we trim a tiny bit off the hsts than ending up with skimpy ones.
The 3.5 inch trimmed hst's will finjsh to 3 inch squares when sewn into a block.
Maybe read the rest of the instructions before panicking. .?
( ign ore the emoticons. I can not make them go away)