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) scaricato 621 volta(e).
HCl recycle_advanced.pdf (777,98 KiB) scaricato 678 volta(e).
HCl recycle_advanced.sm (114,67 KiB) scaricato 736 volta(e).

Hi. Notes in yellow.

HCl recycle_advanced.sm (120,12 KiB) scaricato 777 volta(e).
HCl recycle_advanced.pdf (867,05 KiB) scaricato 637 volta(e).

Best regards.
Alvaro.

Extremely thanks & another thanks for your explanations.