Yes, that is a problem with PUBG hacks. The game's developers have implemented a number of anti-cheat measures, one of which is to make it difficult for hackers to see other players on the map. This is done by obfuscating the positions of other players, so that they appear as blank spaces on the map. This makes it difficult for hackers to track the movements of other players and to target them with their hacks.
However, there are still ways for hackers to get around this anti-cheat measure. One way is to use a hack that allows them to see the real positions of other players on the map. Another way is to use a hack that allows them to see through walls, so that they can see other players even if they are not visible on the map.
The developers of PUBG are constantly working to update their anti-cheat measures in order to keep hackers at bay. However, as long as there is a demand for PUBG hacks, there will always be people who find ways to circumvent the anti-cheat measures.