Hello,
The field has CSS You can use the following Custom CSS to solve the phone field issue. You can paste it into the additional css section of your theme’s customizer.
.rtb-text.phone input {
color: black !important;
}
Regarding the confirmation emails not sending, if some are getting through and others aren’t, that really sounds like a spam issue. If there was an issue with the plugin not sending any emails, then it would be for all of them. Nevertheless, to double check this, you could install a plugin like https://www.ads-software.com/plugins/email-log/, which logs every email sent from your WordPress. When you don’t get one in your inbox, check to see if it shows in the log as sent. If so, you know it’s likely a spam filter issue. For that, I would recommend using a plugin like https://www.ads-software.com/plugins/wp-mail-smtp/, which lets you route emails via your real email address, so they are not coming from an auto-mailer, or address that doesn’t exist, and have a much higher chance of making it through spam filters.
About the form, if you are using Booking Page option from plugin’s Basic setting, I would suggest use the shortcode [booking-form]
on the page to display the form.