Eat Out To Help Out - different menu, inflated prices

[LoveLastMinutesAndLostEvenings]

DP and I don't eat out very often, but decided to take advantage of the Eat Out To Help Out discount to support our local pub yesterday. I'd looked at their menu online before because I can be a bit picky with food and decided on their burger, £13.50. When we got there and were seated they bought the menu over, and it was different to the one online. There was a burger but it was described differently - and £20, so £10 with the offer instead of the £6.75 I'd expected to pay. There was nothing on the menu that was on their online menu, so no prices to compare. I wouldn't have paid £20 for a burger pre-Covid!
I have to say it was a bloody lovely burger and I'm not complaining about a few extra £ for a business that is probably struggling right now. I'm just wondering if this is usual at the moment? What are your experiences of Eat Out To Help Out?

@Haworthia

A restaurant local to me have whacked on a cover charge of £5 per person. They never had a cover charge pre COVID.

They also never had to have more staff & fewer tables, loads more cleaning, disposable stuff etc. Plus the cost of food has gone up.

It's a tricky one, but if we want them to survive this, they have to price according to the turnover they need not to go under.

We went to our favourite restaurant and got £20 off our bill, it was fancy and we had a bottle of wine so was chuffed to pay £50 for the two of us instead of £70!