Fix the Positioning Bug of CombinerGenerator

[miaoyinb]

closes #29596

[moosebuild]

Job Coverage, step Generate coverage on 842fa6b wanted to post the following:

Framework coverage

	7d4ab7	#29597 842fa6
	Total	Total	+/-	New
Rate	85.25%	85.25%	-0.00%	100.00%
Hits	108007	108009	+2	3
Misses	18682	18683	+1	0

Diff coverage report

Full coverage report

Modules coverage

Coverage did not change

Full coverage reports

Reports

• framework
• chemical_reactions
• combined
• contact
• electromagnetics
• external_petsc_solver
• fluid_properties
• fsi
• functional_expansion_tools
• geochemistry
• heat_transfer
• level_set
• misc
• navier_stokes
• optimization
• peridynamics
• phase_field
• porous_flow
• ray_tracing
• rdg
• reactor
• richards
• scalar_transport
• solid_mechanics
• solid_properties
• stochastic_tools
• thermal_hydraulics
• xfem

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[moosebuild]

Job Documentation, step Docs: sync website on 842fa6b wanted to post the following:

View the site here

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[GiudGiud]

good catch! thanks for the fix