I went to a Big Lots today and had one of the weirdest shopping experiences. I'll try to get to it, but bear with me because I'm tired as

. On the videogame shelf they had a big red sign that says 75% off the tagged price. I was wondering why I didn't hear about the price drop from CAG first, but I proceed to pick out a bunch of games to buy. Of course they ring up 50% off. The 75% off sign wasn't supposed to go up until next week (a store manager told me). She said on Sunday they should ring up 75% off automatically. Is Sunday the first day of weekly ad rotation at Big Lots? I figured it was a good idea to confirm with you guys.
Anyway, that's not the weird part. The cashier said that she'd manually override the 75% off price. I couldn't see what she was doing until I got my order total, which was higher than 75% off. The games that were $10 were priced correctly. She totaled those as $2.50 each. The games that were any other price, she took 25% off... meaning if a game was $18.88, she rung it up as $7.08 ($9.44 x .75).
I said to the cashier that I was very very thankful that they are honoring the incorrect sign, but that the manual overrides weren't 75% off. I even showed them the $18.88 example on my phone and showed how it worked out to $4.72. The gentleman waiting in line behind me (who I apologized to repeatedly for the wait), agreed with what I was saying. The Big Lots cashier and manager did not understand what I was talking about at all. It wasn't that they told me "that's not how we do manual overrides. That's not our policy." I would have just agreed to that BS if they said something along those lines. That's how some stores do clearance markdowns (but the sign does say "75% off the tagged price"). They just said "No, these are correct."
I'm just thankful the cashier could do the $10 games in her head without a calculator. I was very happy to get those for $2.50 + tax. Any other game that wasn't $10, she mispriced. The $7.99 games were rung up as $3 for example instead of $2. It was just one of the strangest and most frustrating shopping experiences I've ever been a part of. I wasn't angry at all. I was just bewildered and thankful that I paid attention in math class as a child.
You guys are going to think I'm crazy, but I only bought the $10 games that were priced to $2.50 and one $7.99 game that was priced to $3. I really put the "Cheap" in CheapAssGamer... I just didn't want the games bad enough. I might check and see if there's anything left Sunday morning.
I know I'm crazy for not buying the games (and I know I'm kind of a jerk for trying to teach math to these employees), but am I crazy for thinking that 75% off of $18.88 doesn't equal $7.08? Am I crazy for thinking that 75% off of $7.99 doesn't equal $3? I'm legitimately asking right now because I'm very tired and questioning my own sanity.