I tried to reproduce the described issue on my side but to no avail. I am sending you a simple example based on your toolbar declarations with the latest version of the kendo scripts. Please check it out and let me know what differs in your case.
Additionally I assume that you have some custom css styles which may cause the described behavior. Can you inspect the bolded texts of the buttons and check if there is additional css applied on them.
Looking forward for your reply.
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