The colour of the text changes in preview mode

Hello,

I am currently building a new landingspage and working with different text boxes. In these textboxes I want to highlight some important words in pink. In the edit mode, everything looks fine. All the words I want pink are pink. But when I open the preview mode, these words are blue instead of pink. I checked the colourcode to find out if there were mistakes, but the html code did contain the correct colourcode for pink (e5007d). The blue the words end up in, are the colour I used in the header and titles (3d71a1). I have tried to delete the boxes and start again, but the same problem occured. The strangest thing is, in one textbox everything worked out as I wanted, but when I copied said box and edited it, the copied box showed again blue instead of pink in the preview mode.
Can you help me solve this problem?

Thanks!

Best regards,

Iris