What is the frequency of the PL those repeaters use? The higher frequencies, like up in the 200 Hz range, are a lot closer to the audio pass band of your radio than the lower tones (like down around 70 Hz). It may just be that your radio passes really low frequencies. Do you have a DSP or something you could adjust?
Or, it could be those repeaters are transmitting tones "louder" than other repeaters.
I guess you could say something to the control ops about. Approach it as a question and a learning opportunity. Don't come across like there's something wrong with their repeater and they need to fix it for you. Remember, they are just fellow hams providing a repeater for others to use out of the kindness of their hearts. Repeater ownership is time consuming and expensive.