Although the external data can cover a larger area the grid mesh in the overlapping region has to be exactly the same as defined in the namelist. In your case the definition
startlon_tot = -1.08
seems to be the problem, please try e.g.
startlon_tot = -1.081
startlon_tot = -1.09
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Although the external data can cover a larger area the grid mesh in the overlapping region has to be exactly the same as defined in the namelist. In your case the definition
startlon_tot = -1.08
seems to be the problem, please try e.g.startlon_tot = -1.081
startlon_tot = -1.09