Unable to focus to 300 yards - Lucid Optics Advantage 6-24x50 Rifle Scope

I wanted a scope for a new rifle build and came across this scope from recomendations and generally good reviews from different websites. I ordered one because it meets my needs on paper and the price was great. Scope arrive in a big optic planet brown box with the scope in a white box wraped in bubble. I opened the box and immediately tried to focus on my neighbors chimney which is about 250 yards away, notice that I can not get a clear focus. Tried turning the ocular adjustment all the way ( also tried adjusting parallax) both directions and still was not able to get a clear focus the following day went to the range to try the scope again and at 300 yards focus is so bad I can not see any details on my paper target I only see a white square no other detail is recognized. Move to 100 yards and was able to focus at the target with a crisp clear picture colors were vibrant but the ocular adjustments were already max out at 100 yrds. Then a friend noticed that the front glass was dirty from the inside which might cause the problem. I contacted Lucid and sent them a picture of the problem and they said they can not see any problem from the pictures I sent, so I sent the same picture this time side by side with a picture of my PST they might have thought the dirt was just shadows. They offered to have the scope check but I opted to return the scope for for exchange. The replacement arrived in 10days with shipping paid by Opticsplanet. This time the glass was clear went to the range to try at 300 yards I can see details but can not get a clear focus ,all adjustments were already maxed out. I then put the scope in the box and sent it back for replacement this time with a PST.Cost 2x more but worth it.