I am attaching x2 pdf files & x1 .sm file

Under Win10 the program fails to calculate aforementioned functions (_bad.pdf) properly, however, in Win11 the results are as expected

Before running the worksheet In Tools >> Options >> Calculations >> Roots Range is modified from 0 to 20

HCl recycle_advanced_bad.pdf (804.09 KiB) downloaded 370 time(s).
HCl recycle_advanced.pdf (777.98 KiB) downloaded 346 time(s).
HCl recycle_advanced.sm (114.67 KiB) downloaded 377 time(s).

Hi. Notes in yellow.

HCl recycle_advanced.sm (120.12 KiB) downloaded 411 time(s).
HCl recycle_advanced.pdf (867.05 KiB) downloaded 370 time(s).

Best regards.
Alvaro.

Extremely thanks & another thanks for your explanations.