Hello, I have a question for You: why have I lost first 2 bids from high (with Red background) in the screenshot attached? My bids are higher than winners but they was not bidded so I lost them :(
Here my screenshot: https://paste.pics/C6YN7
Thanks.

Hello Max,
Thank you for your question about Bid Groups. By definition, any items you place in a Bid Group will be turned off as soon as you win an item in that group. You can tell them apart: The "win in group" icon is slightly different than the "win" icon. (The smiley face is winking.)
Here is our help page on that subject: https://bidslammer.com/help/bid_groups
Please let us know if you have any other questions. We welcome any other questions that you may have.

My previous answer above was incorrect.
The true reason you lost these snipes is that the seller has "hard blocked" you from bidding on their auctions.
Generally this is because of a limit the seller has set on how many items each buyer can buy from them. There are a few more reasons discussed in the eBay help pages.
Please let us know if you have any other questions, or require other assistance. We are happy to help.