My EEG topographic map is like this, how should I solve it?

@Kirito By not normal I assume you mean - the channels are far away from head circle. If so, take a look at the following thread:

you can also try manipulating the sphere argument to see how that changes the channel layout. See this tutorial to better understand what sphere argument does and how to use it:
https://mne.tools/dev/auto_tutorials/intro/40_sensor_locations.html#controlling-channel-projection-mne-vs-eeglab