Sample peak is the largest value stored in the file. True peak estimates the highest point of the actual waveform between those samples, by oversampling, as ITU-R BS.1770 describes. It can be higher than the sample peak.
Peaks between samples matter when audio is converted or encoded to MP3 or AAC: a file that never touches 0 dBFS can still clip after encoding. That is why Apple Podcasts asks for true peaks no higher than -1 dBFS, and Spotify asks music for peaks under -1 dBTP.
Samples at full scale are within 0.03 dB of the digital maximum. Several in a row usually mean the recording clipped, and no later processing can rebuild what was cut off.
To fix hot peaks, lower the overall level or use a true-peak limiter set to -1 dBTP. If the recording itself clipped, record again with the input gain a step lower.