Hello Alex,
Sorry for the delay.
I think I couldn’t reproduce the problem. If the limit is 1 and I add 1 to cart the plugin should allow the purchase just fine and that is what it’s doing . It doesn’t make any difference if I use a 100% coupon or not. Now, if I try to add 2 of the same product, I can only purchase it if I use the coupon and if I do that it works fine too, I mean, I didn’t receive the max message.
Please help me with some details.
1. How should be set the mode option? I imagine it should be set as “Product Prices” considering your example.
2. Have you purchased the product previously first?
3. Can you please try to disable other plugins that could be conflicting with our plugin and maybe switch the theme too?