Automating Outlook from Excel leading to different row heights on different computers

A colleague is automating the creation of an email report in MS Outlook 2013 from MS Excel 2013 using the following code from Ron de Bruin.

The code ignores charts so what we have done is merge all the cells behind where a charts sits on the spreadsheet and then once we have the email in Outlook (we use the .display property rather than .send so we can check and edit the mail before sending it) we can just regular copy and paste the charts into these merged cell blocks and everything looks great.

However, when we use the exact same spreadsheet (it's on a network drive) on a different computer, the mail in outlook has different row heights. This means that the merged cell block is now taller and when we paste the charts in they no longer fill the space.

Does anyone know of a Windows / Outlook / Excel setting that might be causing this? We're running Windows 8 and Office 2013 Home and Business.

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