  The helimagnetic compounds MnSi$_{1-x}$Ge$_{x}$ show the three-dimensional
multiple-$q$ order as referred to as spin-hedgehog-anti-hedgehog (SHAH)
lattice. Two representative forms of SHAH are cubic-3$q$ lattice with $q \|
\langle100\rangle$ and tetrahedral-4$q$ lattice with $q \| \langle111\rangle$,
which show up typically for $x=1.0-~0.8$ and for $x=0.6$, respectively. Here,
we have investigated the spin fluctuations in the MnSi$_{1-x}$Ge$_{x}$
polycrystalline samples with $x=0.6$ and $0.8$ by using the time-of-flight
(TOF) neutron inelastic scattering and MIEZE-type neutron spin echo techniques
to elucidate the microscopic origin of the unconventional Hall effect in the
SHAH lattice states. This research is motivated by the observation of a sign
change in the unconventional Hall resistivity as a function of temperature [Y.
Fujishiro et al., Nat. Comm. $\textbf{10}$, 1059 (2019)]. The present results
reveal the correspondences between the temperature ranges where the positive
Hall resistivity and spin fluctuations are observed. These results agree well
with the theoretical model of the conduction electrons scattered by the
fluctuating spin clusters with a non-zero average of sign-biased scalar spin
chirality as a mechanism of the positive Hall resistivity [H. Ishizuka and N.
Nagaosa, Sci. Adv. $\textbf{4}$, eaap9962 (2018)].
