"around" is not good enough. Get a test record that reports the frequency such as the Hi Fi News Analog Test Record so we have a better idea what is going on. Right now just listen to music and enjoy. In the end what are you going to do about this, get a new cartridge? I think not, especially if you like the sound of the one you have now.
Frequency response off with test record
I was running some tests with the Analogue Productions Ultimate Test record, and on Track 7, side 1, I found that my frequency response seemed off, peaked somewhere in the middle of the 1 kHz to 20 Hz range, in about the 3rd to 6th frequency down. Is this likely a cartridge issue or a preamp/loading issue? I was measuring with an oscilloscope from the tape outputs of my preamp. The cartridge is a Transfiguration Phoenix and the preamp a Spectral DMC-20. If I remember correctly, I think the cartridge load is about 100 Ohms.