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 КиБ) скачан 52 раз(а).
HCl recycle_advanced.pdf (777,98 КиБ) скачан 56 раз(а).
HCl recycle_advanced.sm (114,67 КиБ) скачан 62 раз(а).

Hi. Notes in yellow.

HCl recycle_advanced.sm (120,12 КиБ) скачан 85 раз(а).
HCl recycle_advanced.pdf (867,05 КиБ) скачан 72 раз(а).

Best regards.
Alvaro.

Extremely thanks & another thanks for your explanations.