Possible issue with Iframe names?

[galatai]

Have created an Iframe with the address https://ciu.xxxxx.co.uk/DBcreate/CIU-Events-100.php which works well, however, when I go to edit this for another page to go into the frame ... https://ciu.xxxxx.co.uk/DBcreate/CIU-Events-200.php and just change the 100 to 200 then the CIU-Events part turns into CIU-events and obvoiusly the page will not load due to the difference in name. The CORRECT address is shown on the WYSIWYG but selecting the frame it becomes incorrect. The only way round this is to rewrite the whole of the https address again and re-publishing.
Could you have a look at this please? Thanks
Keep up the good work!