css - Bootstrap Caret collapsing -

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i have been working on bootstrap reskinning project, , ran odd bug buttons.

the caret in dropdown seem collapsing when used btn-lg class (as shown in 2 images below). i've did comparison on compiled css on btn, dropdown-toggle , caret, , nothing significant (other margin, padding, colors etc) seem different.

any appreciated! thanks!

collapsed caret

original bootstrap caret


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