The positive ion mobility in normal liquid He-3 has been measured as a func
tion of external magnetic field up to 15 T at temperatures down to 3 mK. At
3.2 mK, the field dependence is found to exhibit a pressure-dependent broa
d peak followed by a large decrease at pressures above 20 bars. On the othe
r hand, at 20 mK, a monotonic decrease with increasing the magnetic field h
as been observed in the same pressure region. Possible origins for these an
omalous behaviors are discussed.