Bug 467852

Created attachment 157630 [details]
Original IHT407 form unfilled

SUMMARY
In the attached (government issued) form, the summation of fields is working as concatenation rather than summing the values.
The original form is available: https://www.gov.uk/government/publications/inheritance-tax-household-and-personal-goods-iht407
I've attached:
  a) An original version
  b) A version with a value in the first entry in page 2 of £300, top row, and you can see the total field at the bottom has a load of 0's that correspond to each row adding an extra '0' to the result; this carries into the total on the next page

STEPS TO REPRODUCE
1.  Load the empty form
2.  Enter a numeric value, e.g. 300, into the top right field on page 2 (Open market value, top row)
3. Enter another numeric value, e.g. 55 into the page 4 field 4, 'Total value of other'

OBSERVED RESULT
The total on page 2 is 3000000000000000000
The total on page 5 is something like 300000000000000000055

EXPECTED RESULT
£300 and £355

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Fedora 37
(available in About System)
KDE Plasma Version: 5.27.3 - but running under xfce
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION
I've seen a non-reproducible crash on that form and other oddities, try tabbing around on page 2